GM Engine Coolant Thermostat Kit 14-20 12674639 Mounting HardwareThe GM 12674639 Water Pump Outlet Assembly with Thermostat is designed for vehicles such as the Cadillac Escalade Chevrolet Silverado Suburban Tahoe and GMC Sierra 1500. Engineered to rigorous General Motors standards it includes a gasket housing and thermostat ensuring optimal performance and reliability for 5. 3L engines. This assembly improves engine cooling efficiency and is critical for maintaining proper engine temperature. All parts